Manufacture of high-potential porcelain and glass insulators.



s'rATEs PATENT orFI'cn.

' snap at. LOCKE, or vrc'roa; NEw YORK, I

M;ANUFACTUBE or men-rornutrmn PORCELAIN m GLASS msunarons.

' facture, the essential ingredients of which I tric strength are boron or boron compound and porcelain or glass thoroughly mixed by trituration or levigation and then molded and fired in the usual manner for porcelain or glass lnsulators.

The use of glass as an insulator for high 1 great toughness to the insulator, is probto the fact that boron and hydropotential electric conductors is recognize by manufacturers and users as being imracticable owing to its brittleness and susceptibility to breakage by varying temperatures or climatic conditions, and also from the dielectric stresses and resultant heat to which it is subjected. For this reason porcelain,-which appears to have a greater die lectric strength and is less susceptible to breakage by variations in temperature or climatic conditions, is generally employed. By porcelain I mean a compound of the usual ingredients well known in the art as silica, aluminum clay and feldspar.

The primary object of my present invention is to increase the inductive capacity, dielectric-strength and heat-resisting prop erties of this class of insulators to more effectively resist puncture or disintegration by an electric current or static charges therefrom, or from temperature or climatic changes I have discovered that by incorporating a suitable quantity of boron or boron compound, such as boracic acid, with the body of-porcelain or glass usually employed for insulators, the inductive capacity, dielecand resistance to puncture or the electric current and disintegration by or cllmatic'changes, arc

sudden temperature increased approximately 20% over the same I size and form of the best of porcelain lIlSlllators. For example, which I ha re made to determine the relative specific inductive capacity of air, glass, por- Speciflca'tion of Letters Patent. 7

I voltage,

'ron compound ranging article of manufacture,

in the experiments ,sulating support ducto rs are used in the Patented Feb. 2,1915.

Application filed March 9, 1909. Serial No. 482,382.

tion, I find that-the. specific inductive-capacity of this compositionis three times as great as that of the; commercial porcelain insulators of the-same size and form; six times as great as glass, and twelve times as great as am In the tests which I have made to determine the resistance to puncture by 'high' I find that where. a porcelain insulator of the best quality was capable of resisting 80,000 volts, an insulator made of celainand my; improved insulator compost my improved composition and of the same sire and form as the porcelain insulator, withstood 100,000 volts, or 20,000 volts more than the porcelain insulator, which was due solely to the increased specific inductive ca pacity and dielectric strength produced by the boron compound. This high inductive capa'clty and dielectric strength whichv gives well as nonpuncturability and resistance to heat. v

The composition and manufacture of high potential porcelain and glass insulators is well understood, and in the formation of my improved composition the boron compound, such as boric acid, and porcelain or glass ingredients, are thoroughly mixed in suitable proportions, the proportion of boto 60%, 'accordin to the specific inductive capacity require although. the smallest percentage is eflective in adding materially to the dielectric strength and tenacity of the insulator, whether the base'is porcelain or 100 glass, and reduces the liability to puncture and breaking down by the electric current or static charges to a minimum.

The invention herein relates to a structure nical meaning of and the terms 1nfor line conductors and insulator for high potentialelectric conanywhere from 1% adapted to serve as an msulatorinthe techthe term as applied to an claims herein. to

clearly define such structure-as an article of 'manufacture to serve as an insulator in the base and a boron compound or derix ative fused together in a homogeneous body.

2. An insulator-for high potential electric conductors as an independent article of manufacture formed as an entirety of a composition material composed of a fusible base and a boron compound fused together. 3. As an articleof manufacture, lating support for line conductors formed as a whole of a composition body including a boron compound molded and'fired.

4. As an article of manufacture, an insulator for high potential electric'conductors an insu-' formed as an entirety of a vitrifiable base and a boron compound molded and fired to form a homogeneous body.

5. As an article of manufacture, an insulating support for line conductors formed as an entirety of a vitrifiable base and a boron compound fused together to form a homogeneous body.

6. An insulating support for line conductors composed of a glass base and a boron compound fused therewith to form a homogeneous body.v

In witness whereof I have hereunto set my hand this 1909. H

FRED M. LOCKE;

Witnesses: C. 0. Moon,

A. HIGINBOTHAM. 

